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Things have been really messed up with my app since last update. Entered exercise disappears, info on wrong days, sleep data not showing up completely. Very frustrating.
Although I'm not sure that this will work, you can try clearing the cache & storage/data for the Fitbit app on your phone, then force stop the app. You'll need to log back in after clearing the storage/data. Then try syncing again with the app.
Let us know if this helped restore your ability to see your data in the app.
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